schmelz



' C. F. SCHMELZ PIPE THREADING AND CUTTING OFF MACHINE.

Dec. 22,1925. j v

Filed Dec. 8, 1924 2 Sheets-Sheet 1 Q Q an C. F. SCHMELZ PIPE THREADING AND CUTTING OFF MACHINE Dec. 22, 1925- F'iled Dec. 8, 1924 2 Sheets-Sheet 2 I/VVE/Wk dF-ScnzeZZ.

Patented Dec. 22, 1925.

UNITED STATES PATENT OFFICE...

CHARLES F. SCHMELZ, F BRIDGEPORT, CONNECTICUT, ASSIGNOR T0 CURTIS 8t CURTIS CC, OF BRIDGEPORT, CONNECTICUT, A. CORPORATION OF CONNECTICUT.

' PIPE THREADING nn ou'r'rme-orr iMACI-IINE.

Application filed December 8,1924. Serial 1%. 754,498.

To all whom it may concern:

Be itknown that I, CHARLES F. SOHMELZ, a citizen of the United States, residing at the city of Bridgeport, in the county of Fairfield and State of Connecticut,.have invented certain new and useful Improvements in Pipe Threading and Cutting-Off Machines; and I do declare the following to be a full,

. clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pipe threading and cutting off -machines, and more par, ticularly to that class thereof in which the pipe or work is held stationary while the threading dies as well as the out 01f tool are revolved around it.- v

Myinvention has for one of its objects the provision of a machine of this character in which the main gear or die carriermay be moved forward or rearward in its supporting shell or housing by a hand lever which is permanently connected with said gear by intervening mechanism including a grooved ring on the gear, this grooved ring performing the triple function of first, actingas a continuous bearing member for the gear in the shell, second, forming the element whereby the gear may be moved longitudinally in the shell through shoes and the lever above mentione and third, serving as one wall of a lubricant chamber from which oil may be automatically distributed to the interior of the shell, to the several threading dies, and also to the cut off tool, during the operation of the machine.

A further object of the invention resides in the provision of means whereby the main gear or die carrier may be locked against longitudinal sliding movement in. the shell during the cutting off operation, these looking means being effective at any position of the gear in the shell.

Other objects of the invention will hereinafter appear and will be particularly defined in the claims.

In the accompanying drawings Figure 1 is a front 'viewof a machine embodying my invention Figure 2 is a side view of the same- Figures 3'and 4 show detail broken views of oil through a of the trip-pin usedfor the cutting-off 'de- I Figure 5 is a sectional detail of one of the shoes whereby the main gear is moved longitudinally in the shell p v Figure 6 represents a central horizontal section of the machine, and

Figure 7 is a front view of the main gear and the dies carried thereby, the front ring and the face plate having been removed.

In the drawings, 10 denotes the main shell of the machine having at the rear end thereof ways 11 between which are guided for vertical movement a pair of pipe jaws .12, 13, which may be opened and. closed by screws ldeach of which is provided with all of. the active work-elements (such as the threading dies D and also the cut-off tool T) the rotation being clockwise for cutting right hand threads, and vice versa for cutting left hand threads. ,This main gear or die-carrier has peripheral teeth 21, and the outside diameter of the ring is slightly smaller than the inside diameter of the shell so as to establish an annular space all around the gear which is provided, however, at its front end'with a steel ring 22, and at its rear end with a similar ring 23, these two spaced rings constituting not only the bearing members for supporting the gear in theshell, but also serving as side walls of a lubricant chamber which receives a supply ipe 24 leading into the interior of the shell which extends all around the gear between the two rings, as? will be readily understood.

The dies D, four in number, are seated in radial slots. 25 in'the main gear and may be (see Figures 1 and 2) and I tudinal reciprocation in the shell 10, is the 'ITliLlIl gear 20 (see Figure 6) which carries adjusted by a cam ring 26 suitably supported by the main gear, the cam faces 27 of which ring engage the outer ends of said dies, while correspondingly formed grooves 28 in the ring in engagement with the diepins 29 are adapted to open all the'dies simultaneously when the cam-ring is rotated anti-clockwise on the main gear. The die adjustment which is thus provided will enable threads of standard size, oversize or undersize, to be cut.

A face plate 30, secured to main'gear by screws 31, serves to hold the dies as well as the cam in position on the main gear. H

Rotation is impartedto the main gear by a pinion 35, the shaft 36 of which is ournaled in bushings 37'held on the shell by a cap 38 which entirely encloses the pinion and permits the oil from the shell to surround said pinion whichis of such length as to permit the main gear to move longitudmally in the shell without interference with the rings 22, and vet allow a full length thread to be out. The shaft 36carries at its rear end a gear 39 which may be driven from any convenient source. 7 V

Lubricant issupplied continuously to each of the dies, as follows z- I An oil channel 40 (for each die) extends radially from a tooth space of the main gear to a point where it intersects a longitudinal duct 41 which, in turn, has a pair of radial outlets 42 so situated that the oil will be delivered directly in front of the cutting face of the dies (see Figures 6 and 7). The flow of oil may be regulated by a needle valve 43 the stem of which is in screw thread engagement with the face plate, while its rear or needle end is adapted to control the opening of the duct 41 near its point of intersection with the channel 40. e A similar oiling organization is provided for the cut off tool T above mentioned and shown in Figure 6, in which 45 denotes a block secured to the face plate 30 and having a recess 46 in which a nut 47 travels as it is operated by a screw 48, the nut 47 hav ing a pin connecting it with the out 01f tool, while the screw 48 has at its outer end a star wheel 49 which is adapted to be intermittently rotated by a trip pin 50 to be hereinafter described. In this instance a radial channel 51 leads from a tooth space to the longitudinal duct 52 the front end of which connects with a radial groove 58 in the front face of theface plate adjacent to the cutting tool, so

that the oil will be conducted directly againstthe back face of the latter and to ward'the inner or cutting end thereof. A needle valve 54 serves to control the flow of oil through the duct .52.

From the above it will be understood that each of the dies and also the cutting off tool are individually subject to lubrication as controlled by their severalneedle valves, re-

spectively, and irrespective of the position of the main gear in the shell.

As before stated, in the present type of machine, the pipe P is clamped in the jaws against rotary aswell as longitudinal move-' matic, similarto that of a hand die stock.

This primary longitudinal movement is imparted to the main gear by an arched lever 55 pivotednear its opposite ends on studs 56 and connected by links '57 58, witha pair of pressure bars 59, 60, each of which is slidable in a recess ain the shell and has a shoe 61 (see Figures 5 and 6) riding in the groove 62 of the front ring 22 above referred to, the shell rim being slotted, as at 63, to permit the stem of the shoe to travel rearwardly. A packing 64 secured to each bar serves to prevent leakage of oil at this point. N ow, inasmuch as the longitudinal positions of the main gear and both pressure bars al'- ways remain the same relatively to each other, and as, furthermore, the cut-off block is carried by the main gear, I have provided in connection with the left bar 59, the trip pin 50 above mentioned, so that for each r0-.

' ceive a spring pressed ball '67 which hold the pin against accidental sliding movement when in G1thBYP1O18CtGCl orretracted pos1- tion, and which furthermore hold the pin.

against rotation, it being rather essential that the nose of the trip pin, which is cut away as shown in Figure .4, shall retain that position to prevent crowning of the star wheel points on the pin nose. When the pin has been withdrawn ,sufliciently tohave the ball'67 seated in the recess 66, the nose is out'of reach of the star wheel, and vice versa.

When it is desired to cut off the pipe, the main gear must be stationary, longitudinally, it being understood, of course, that the threading dies are then out of actionvand withdrawn by an anti-clockwise movement of the cam 26 above described. The main gear is locked against longitudinal movement by a rider TOthe rear end of which is slotted and straddles a clamping screw stud 7'1 threaded inthe shell, while its forward end is pivoted to one of the endsof the arched lever 55. I

' It will be understood that the main gear i .may be moved by hand back and forth in the shell as long as the clamp screw 71 is loose, so that, rather than move the pipe longitudinally to meet the required position for cutting-oil, the gear may be moved to bring the cutting-0H3 tool into the desired position on the pipe clamped in the jaws of the machine, without interfering with the supply of the necessary lubrication from the interior of the shell. j

Having thus described my invention What is claimed is Y 7 1. A machine of the character described, comprising a shell, a die carrier gear circumferentially spaced from said shell and having rings at its ends whereby said gear vis journaled in said shell, an enclosed pinion extending Within said shell and in mesh with said gear, and means for supplying a lubricant within the space between said shell and ear.

g 2. In a machine of the character described, the combination of a shell, a die carrying gear rotatably journaled at its ends within said shell and spaced from the latter intermediate said journals, an enclosed pinion 1n mesh with said gear, threading and cutting off dies carried by said gear, means for supplying lubricant within the space between said gear and shell, and ductscommunicating with said space and leading to said dies for supplying lubricant to the lat- 1161.

3. A machine of the character described, comprising a shell, a die carrier gear rotatable in said shell and having spaced hearing rings forming in conjunction with the gear for conducting oil from said oil chamher to said dies respectively, and means for supp-lying oil to said chamber.

4, A' machine of the character described, comprising a shell, a die carrier gear rotatable in saidshell and having spaced bearing rings forming in conjunction With the interior wall of the shell an oil chamber, dies carried by said gear, ducts formed in said gear for conducting oil from said oil chamber to said dies respectively, means for supplyingoil to said chamber, and means for controlling the flow of oil through said ducts.

5A machine of the character described, comprising a shell, a die carrier gear rotatable in said shell and having spaced hearing rings forming in conjunction with the interior Wall of the shell an oil chamber, threading and cutting off dies carried by said gear, means for manually shifting said gear longitudinally within said shell, means for supplying oil tosaid chamber, and ducts leading from the latter to saiddies for supplying oil to the dies. 7. v

6. A-machine of the character described, comprising a shell, a die carrier gear rotatable in said shell and having spaced bearing rings forming inconjunction with the interior Wall of the shell an oil chamber, threading and cutting off dies carried by said gear, means for manually shifting said gear longitudinally within said shell, means for supplying oil to said-chamber, ducts leading from the latter to said dies for supplying oil to the dies, and means for looking said shifting means against displacement.

In testimonv whereof I affix my signature hereto.

CHARLES F. SCHMELZ. 

